Uma : Mass is neither created nor destroyed during a chemical reaction. Rama : Matter is conserved in a chemical reaction. 

Correct option is: (A) Momentum and K.E. is conserved.

As per kinetic theory of gases, for an ideal gas, there are no forces between the molecules of a gas. Hence, gases neither have a definite volume nor shape.

C) Conjectures

D) Compounds are formed when atoms of different elements combine in whole number ratios.

C) Law of conservation of mass

Correct option is D) neutron

C) ‘A’ is correct, but ‘R’ is incorrect.

D) Both are right

The correct answer is B) Salt

C) Both Uma and Usha are correct